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Shifts in Diversification Rates and Host Jump Frequencies Shaped the Diversity of Host Range Among Sclerotiniaceae Fungal Plant Pathogens

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Shifts in Diversification Rates and Host Jump Frequencies Shaped the Diversity of Host Range Among Sclerotiniaceae Fungal Plant Pathogens View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Warwick Research Archives Portal Repository Original citation: Navaud, Olivier, Barbacci, Adelin, Taylor, Andrew, Clarkson, John P. and Raffaele, Sylvain (2018) Shifts in diversification rates and host jump frequencies shaped the diversity of host range among Sclerotiniaceae fungal plant pathogens. Molecular Ecology . doi:10.1111/mec.14523 Permanent WRAP URL: http://wrap.warwick.ac.uk/100464 Copyright and reuse: The Warwick Research Archive Portal (WRAP) makes this work of researchers of the University of Warwick available open access under the following conditions. This article is made available under the Creative Commons Attribution 4.0 International license (CC BY 4.0) and may be reused according to the conditions of the license. For more details see: http://creativecommons.org/licenses/by/4.0/ A note on versions: The version presented in WRAP is the published version, or, version of record, and may be cited as it appears here. For more information, please contact the WRAP Team at: [email protected] warwick.ac.uk/lib-publications Received: 30 May 2017 | Revised: 26 January 2018 | Accepted: 29 January 2018 DOI: 10.1111/mec.14523 ORIGINAL ARTICLE Shifts in diversification rates and host jump frequencies shaped the diversity of host range among Sclerotiniaceae fungal plant pathogens Olivier Navaud1 | Adelin Barbacci1 | Andrew Taylor2 | John P. Clarkson2 | Sylvain Raffaele1 1LIPM, Universite de Toulouse, INRA, CNRS, Castanet-Tolosan, France Abstract 2Warwick Crop Centre, School of Life The range of hosts that a parasite can infect in nature is a trait determined by its Sciences, University of Warwick, Coventry, own evolutionary history and that of its potential hosts. However, knowledge on UK host range diversity and evolution at the family level is often lacking. Here, we Correspondence investigate host range variation and diversification trends within the Sclerotiniaceae, Sylvain Raffaele, LIPM, Universitede Toulouse, INRA, CNRS, Castanet-Tolosan, a family of Ascomycete fungi. Using a phylogenetic framework, we associate diversi- France. fication rates, the frequency of host jump events and host range variation during Email:[email protected] the evolution of this family. Variations in diversification rate during the evolution of Funding information the Sclerotiniaceae define three major macro-evolutionary regimes with contrasted European Research Council, Grant/Award Number: ERC-StG-336808; the French proportions of species infecting a broad range of hosts. Host–parasite cophyloge- Laboratory of Excellence project TULIP, netic analyses pointed towards parasite radiation on distant hosts long after host Grant/Award Number: ANR-10-LABX-41, ANR-11-IDEX-0002-02 speciation (host jump or duplication events) as the dominant mode of association with plants in the Sclerotiniaceae. The intermediate macro-evolutionary regime showed a low diversification rate, high frequency of duplication events and the highest proportion of broad host range species. Our findings suggest that the emer- gence of broad host range fungal pathogens results largely from host jumps, as pre- viously reported for oomycete parasites, probably combined with low speciation rates. These results have important implications for our understanding of fungal par- asites evolution and are of particular relevance for the durable management of dis- ease epidemics. KEYWORDS angiosperms, coevolution, fungi, host parasite interactions 1 | INTRODUCTION infect more than a hundred unrelated host species (Barrett, Kniskern, Bodenhausen, Zhang, & Bergelson, 2009; Woolhouse, Taylor, & Hay- The host range of a parasite has a central influence on the emergence don, 2001). Host specialization, when lineages evolve to infect a nar- and spread of disease (Woolhouse & Gowtage-Sequeria, 2005). There rower range of hosts than related lineages, is a frequent occurrence in is a clear demarcation between specialist parasites that can only infect living systems and can be driven by a parasite sharing habitat with only one or a few closely related host species, and generalists that can a limited number of potential hosts. There are also clear examples of ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2018 The Authors. Molecular Ecology Published by John Wiley & Sons Ltd | Molecular Ecology. 2018;1–15. wileyonlinelibrary.com/journal/mec 1 2 | NAVAUD ET AL. parasite adaptations that restrict the use of co-occurring potential how fungal host range has changed over time. The relationship hosts. For instance, the red rust fungal pathogen Coleosporium ipo- between host range and diversification rates is an active area of moeae infects fewer Ipomoea species from its native community than research in insect ecology (Hamm & Fordyce, 2015; Hardy & Otto, when inoculated to non-native communities, implying that evolution 2014). For instance, a positive correlation was reported between spe- within local communities has narrowed pathogen host range (Chappell cies richness in the butterfly family Nymphalidae and the diversity of & Rausher, 2016). Some isolates of the rice blast fungus Magnaporthe plants they feed upon (Janz, Nylin, & Wahlberg, 2006). However in oryzae are able to infect Oryza sativa japonica varieties but not indica contrast, some studies found a negative relationship between host- varieties co-occurring in the Yuanyang area of China, because their plant breadth and diversification rate (Hardy & Otto, 2014). Transi- genome harbours numerous avirulence effector genes (Liao et al., tions between feeding strategies generally appeared to be associated 2016). It has been proposed that specialization results from trade-offs with shifts in insect diversification rates (Hardy & Otto, 2014; Janz & between traits needed to infect a wide range of hosts (Futuyma & Nylin, 2008). Estimating fungal species divergence times in the Sclero- Moreno, 1988; Joshi & Thompson, 1995). It is frequently associated tiniaceae will allow testing of whether biological diversification is with the loss of traits that are not required to infect a particular host, related to host range variation. such as the loss of lipid synthesis in parasitoid wasps (Visser et al., Host range is a trait determined not only by the evolutionary his- 2010), and the loss of secondary metabolism and carbohydrate active tory of a parasite, but also by that of its potential hosts (Poulin & enzymes in powdery mildew fungal pathogens (Spanu et al., 2010). Keeney, 2008). Accounting for host association patterns should there- Specialization is sometimes considered as an evolutionary dead end fore prove useful to understand host range evolution in the Sclerotini- (Moran, 1988), as gene losses are often irreversible and may lead spe- aceae. The Leotiomycete class diverged less than 200 million years cialist lineages “down a blind alley” that limits transitions back to gen- ago (Beimforde et al., 2014; Prieto & Wedin, 2013) and likely radiated eralism (Day, Hua, & Bromham, 2016; Haldane, 1951). There is with the diversification of flowering plants (Smith, Beaulieu, & Dono- nevertheless evidence for transitions from specialist to generalist para- ghue, 2010). Molecular phylogenetic studies distinguished Myriosclero- sitism (Hu et al., 2014; Johnson, Malenke, & Clayton, 2009). For tinia, Sclerotinia sensu stricto, Botrytis and Botryotinia, and Monilinia instance in plant pathogens, Pseudoperonospora cubensis differs from sensu stricto as monophyletic clades within the Sclerotiniaceae family other downy mildew oomycete pathogens in that it is able to infect a (Holst-Jensen, Vaage, & Schumacher, 1998; Holst-Jensen, Vralstad, & wide range of Cucurbits (Thines & Choi, 2015). For many parasite lin- Schumacher, 2004). A phylogenetic analysis of Monilinia species sug- eages however, knowledge on host range diversity and evolution at gested that cospeciation with host plants was the dominant pattern in the macro-evolutionary level is lacking. this clade (Holst-Jensen, Kohn, Jakobsen, & Schumacher, 1997). By Sclerotiniaceae is a family of Ascomycete fungi of the class Leo- contrast, there was no evidence for cospeciation with host plants in a tiomycetes which includes numerous plant parasites. Among the most phylogenetic analysis of Botrytis species (Staats, Van Baarlen, & Van studied are the grey mould pathogen Botrytis cinerea, considered to be Kan, 2005). Botrytis species were thus proposed to have evolved one of the 10 most devastating plant pathogens (Dean et al., 2012), through host jumps to unrelated host plants followed by adaptation to and the white and stem mould pathogen Sclerotinia sclerotiorum. Both their new hosts (Dong, Raffaele, & Kamoun, 2015; Staats et al., 2005). are economically important pathogens in agriculture that infect hun- Host–parasite cophylogenetic analyses are required to test whether dreds of host plant species (Bolton, Thomma, & Nelson, 2006; Mben- variations in the frequency of host jumps may have impacted on host gue et al., 2016). The Sclerotiniaceae family also includes host range variation in the Sclerotinaceae. specialist parasites such as Ciborinia camelliae that causes flower blight In this study, we
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